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graphics: Skip clearing the screen framebuffer

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This commit is contained in:
Hajime Hoshi 2018-03-05 02:59:52 +09:00
parent 64abc79dc2
commit d523229d9f
1 changed files with 11 additions and 8 deletions
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19
graphicscontext.go
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@ -102,19 +102,22 @@ func (c *graphicsContext) Update(afterFrameUpdate func()) error {
// Clear the screen framebuffer by DrawImage instad of Fill
// to clear the whole region including fullscreen's padding.
op := &DrawImageOptions{}
w, h := emptyImage.Size()
// graphics.MaxImageSize should be the maximum size of framebuffer.
op.GeoM.Scale(graphics.MaxImageSize/float64(w), graphics.MaxImageSize/float64(h))
op.CompositeMode = CompositeModeCopy
op.Filter = filterScreen // any filter is fine: just use the same filter as below.
c.screen.DrawImage(emptyImage, op)
// TODO: This clear is needed only when the screen size is changed.
if c.offsetX > 0 || c.offsetY > 0 {
op := &DrawImageOptions{}
w, h := emptyImage.Size()
// graphics.MaxImageSize should be the maximum size of framebuffer.
op.GeoM.Scale(graphics.MaxImageSize/float64(w), graphics.MaxImageSize/float64(h))
op.CompositeMode = CompositeModeCopy
op.Filter = filterScreen // any filter is fine: just use the same filter as below.
c.screen.DrawImage(emptyImage, op)
}
dw, dh := c.screen.Size()
sw, _ := c.offscreen.Size()
scale := float64(dw) / float64(sw)
op = &DrawImageOptions{}
op := &DrawImageOptions{}
// c.screen is special: its Y axis is down to up,
// and the origin point is lower left.
op.GeoM.Scale(scale, -scale)